Lapidary template and dop-stick



Feb. 21, 1956 F. w. PONTING LAPIDARY TEMPLATE AND DOPSTICK Filed Feb.24, 1953 'INVENTOR. F250 W Pour/ms United States Patent 2,735,246LAPIDARY TEMPLATE AND BOP-SEEK Fred W. Ponting, Phoenix, Ariz.Application February 24, 1953, Serial No. 338,325 2 Claims. (Cl. 51-229)This invention pertains to improvements in a lapidary template anddop-stick.

One of the objects of the present invention is to provide an improvedand simplified lapidary template and dopstick arrangement in which aminimum number of templates are required while being able to get amaximum number of sizes and facets formed on the gem to be ground.

Still another object of this invention is to provide a reversibletemplate and dop-stick assembly for grinding various sizes of jewels andthe like from a single template.

Still another object of this invention is to provide a detachable handlefor the template and gem-holding portion of the dop-stick assembly.

Still another object of this invention is to provide an improvedsecuring means for the template on a dop-stick.

Further features and advantages will appear from a detailed descriptionof the drawings in which:

Fig. l is a general assembly partly in section of a combined lapidarytemplate and dop-stiek incorporating the features of this inventionshown applied to an abrasive wheel.

Fig. 2 is a fragmentary end view of the assembly shown in Fig. 1 showinga second form of holding the work to the template shown applied to anabrasive wheel.

Fig. 3 is a view similar to Fig. 2 but showing still another use of thesame template for preparing work in still a third size and shape shownapplied to an abrasive wheel.

Fig. 4 is an enlarged sectional view through a typical dop-sticktempalte.

Fig. 5 is an enlarged fragmentary view of the template supporting end ofthe dop-stick.

Fig. 6 is a view on the line 6-6 of Fig. 5.

Fig. 7 is a diagram showing how two templates can be made from a singleconical piece of material capable of taking care of six sizes of work tobe lapped.

Fig. 8 is a bracketed view showing a plurality of various sized andshaped templates usable with the dop-stick of Fig. 1.

As illustrative of one embodiment of this invention there is shown adop-stick, Fig. 1, having the main handle portion 10 on the working endof which is provided a flange 11 having an abutment surface 12 whichengages the side faces 13 or 14 of the desired template 15. The template15 may be secured against rotation on the flange 11 by index pins 16rigidly fixed in the flange 11 which engage in mating clearance holes17. As an alternative construction tongues 18 may be formed on theflange 11 projecting above the abutment surface 12 which engage inmating slots 19 formed in the faces 13 and 14 of the template 15.

A suitable draw rod 20 having an integral knurled head 21 projectsthrough the central bore 22 in the handle 10 and has a threaded end 23engaging in the threaded bore 24 of the template 15 whereby turning ofthe knurled knob 21 securely binds the template 15 against the abutmentsurface 12 of the flange 11 on the handle 10.

It is important to note, Figs. 1, 2 and 3, that the work such as a stoneor jewel W to be finished may be applied in three different positionsW1, W2, and W3 by suitable adhesive to the side faces 13 or 14 on thesame template 15 to get three difierent sizes of beveling on thefinished product.

In Fig. 1 is shown the intermediate position W-1 of a jewel W whereinthe large end of the template 15 is facing outwardly but the jewel isbeveled inwardly away from the outer edge 25 of the template. Similarly,in Fig. 3 the jewel W-2 is shown wherein the beveling is done upwardlyand outwardly from the edge 25 of the template to get a much largeroverall size for the work. In Fig. 2 is shown the smallest position withthe template reversed with its large edge 25 back against the flange andits smaller edge 26 facing outwardly and upon which is mounted the workW-3. In this latter instance the smallest size with the same shape thetemplate will thus be formed.

Fig. 8 shows various forms the template 15 may take while stillproducing the three size jewels from the same template as illustrated inFigs. 1, 2, and 3.

Fig. 7 is a diagram illustrating how a conical piece of metal may beutilized in making various sizes of tapered templates by slicing offvarious sections at the points 28, 29, 30, 31, and 32 for example. It isalso to be noted that with only two sizes of templates, six differentsizes of jewels can be easily ground and contoured to precise shape.Preferably the template material is made of hard tool steel, or othertypes of tungsten carbide materials to resist abrasion from thepolishing or abrasive wheels P while at the same time making it possibleto lap the work subject closely to or exactly up against the desiredtemplate shape.

While the apparatus herein disclosed and described constitutes apreferred form of the invention, it is also to be understood that theapparatus is capable of mechanical alteration without departing from thespirit of the invention and that such mechanical arrangement andcommercial adaptation as fall within the scope of the appendant claimsare intended to be included herein.

Having thus fully set forth and described this invention what is claimedand desired to be obtained by United States Letters Patent is:

1. In a lapidary template and dop-stick assembly including a handle, aflange formed on one end of said handle having an abutment surface, abeveled abrasive wheel engaging template having a large edge and asmaller edge, means for mounting said template with either said largeedge or small edge adjacent said abutment surface on said flange, meansinter-engaging between said flange and said template to prevent rotationof said template on said flange and handle, and clamping means forsecuring said template to said abutment surface on said flange, saidmeans including a draw bar extending through a central bore in saidhandle, a threaded end on the outer end of said draw bar engaging athreaded bore in said template, and a knurled knob on the opposite endof said draw bar at the rear end of said handle operable to clamp saidtemplate to said flange on said handle.

2. In a lapidary template and dop-stick assembly including a handle, aflange having an abutment surface thereon, a draw bar rotatable in acentral bore in said handle, a knurled knob fixed on the outer end ofsaid draw bar, a threaded end on the inner end of said draw bar engagingin a threaded bore in a template to be secured to said flange, andtongue-and-groove means between said flange and said template to preventrotation of said template on said flange and handle.

References Cited in the file of this patent UNITED STATES PATENTS109,008 Hill Nov. 8, 1870 633,571 Crocker Sept. 26, 1899 1,643,978Bugbee Oct. 4, 1927 1,940,107 Stichler Dec. 19, 1933 2,293,641 DinhoferAug. 18, 1942 2,668,400 Bacchi Feb. 9, 1954 FOREIGN PATENTS 74,249Switzerland Feb. 1, 1917 485,937 Germany Nov. 6, 1929

